Mitsubishi S6S Troubleshooting
| Engine Model: Mitsubishi S6S |
| Engine Type: 4-cycle inline 6-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 304.9 cu.in (4.99 L) |
| Rated Engine Power: 88.5 Hp (66 kW) at 2500 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine difficult to start or won't start |
Dirty fuel filter - Change filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Dirty or damaged injection nozzles - If necessary, replace with a new nozzle.
Fuel injection pump is not operating properly - Rebuild or install a new injection pump.
Incorrect valve timing - Correct or change timing gear.
Plugged fuel pipes - Clean or change fuel pipes.
Injection timing is improper - Adjust injection timing as required.
Piston rings and cylinder are worn - Replace faulty components.
| Engine starts and stalls suddenly |
Fuel filter element is clogged - Replace the filter element.
Defective fuel injection pump - Install a new pump or rebuild.
Dirty air cleaner - Air filter maintenance required.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine shuts off suddenly while running |
Improper setting of fuel injection pump timing - Set it up as required.
Fuel filter plugging - Clean the filter element.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Service or change injection nozzles.
Incorrect low idle speed adjustment - Correct the settings.
Incorrect valve clearance - Correct valve clearance.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
Defective injection nozzle - Replace injection nozzles.
Dirty fuel lines or hoses - Service fuel hoses and lines.
Dirty air filter - Clean or replace the element.
Cylinder head gasket is blown - Gasket should be replaced.
Improper injection timing - Set the injection timing correctly.
Fuel injection pump is faulty - Replace or rebuild injection pump.
One of moving engine parts has broken - Repair or replace defective components.
Clogged radiator core or damaged radiator cap - Clean radiator or install new cap.
Engine has a lack of coolant - The cooling system needs to be refilled and checked for faults.
Damaged or worn fan belt - Install new fan belt.
Low engine oil level - Check and refill engine oil.
Cylinder head gasket is damaged - Gasket should be replaced.
Improper injection timing - Set up as recommended.
| Insufficient oil pressure |
Insufficient engine oil - Fill up the engine oil.
Oil pump failure - Install a new pump.
Oil filter clogging - Service or change engine oil filter element.
Stuck or worn relief valve - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty parts.
| Excessive oil consumption |
Oil leakage: Seals or gaskets are defective - Replace worn parts to avoid leaks.
Incorrect oil viscosity - Fill up with the correct oil viscosity.
Worn or stuck piston rings - Piston rings replacement required.
Worn valve stems and valve guides - Replace the valves.
Pistons or cylinder liners are scored - Inspect liners and pistons, fit new parts as necessary.
Low coolant temperature - Warm up to required temperature.
Low engine oil level - Checking oil level and add if necessary.
Improper fuel injection timing - Set the fuel pump timing correctly.
Scored or worn pistons - Pistons replacement required.
Connecting rod is worn or misaligned - Align or change connecting rod.
Low battery output voltage - Battery is drained, charge it.
Battery does not hold charge - Service charging system or change battery.
Disconnected cables or faulty battery terminals - Check battery wires and service or replace terminals.
Battery is discharged or defective - Recharge or replace battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Battery needs to be recharged.
Starter motor is damaged - Starter needs to be replaced.
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